Mark incorrect statement w.r.t. phylum Porifera.

Easy

A

Most primitive multicellular animals and have cellular level of organisation.
B

Canal system present. Water enters through ostia in the body $\to$ central cavity spongocoel $\to$ goes out through osculum.
C

Canal system helps in food gathering, respiratory exchange and removal of wastes.
D

Fertilisation is internal, direct development

Solution

In sponges, fertilisation is internal and development is indirect having a larval stage which is morphologically distinct from the adult.
Sponges are primitive multicellular animals and have cellular level of organisation.
They have a water transport or canal system. Water enters through minute pores (ostia) in the body wall into a central cavity, spongocoel, from where it goes out through the osculum.
The pathway of water transport is helpful in food gathering, respiratory exchange and removal of waste.

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